[DeviceMap] Make sure stable diffusion can be loaded from older trans… (#860)

[DeviceMap] Make sure stable diffusion can be loaded from older transformers versiosn

Author: patrickvonplaten

src/diffusers/pipeline_utils.py

@@ -26,6 +26,7 @@
 import diffusers
 import PIL
 from huggingface_hub import snapshot_download
+from packaging import version
 from PIL import Image
 from tqdm.auto import tqdm
 
@@ -45,6 +46,7 @@
 
 
 if is_transformers_available():
+    import transformers
     from transformers import PreTrainedModel
 
 
@@ -505,11 +507,14 @@ def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.P
                     loading_kwargs["provider"] = provider
                     loading_kwargs["sess_options"] = sess_options
 
-                if (
-                    issubclass(class_obj, diffusers.ModelMixin)
-                    or is_transformers_available()
+                is_diffusers_model = issubclass(class_obj, diffusers.ModelMixin)
+                is_transformers_model = (
+                    is_transformers_available()
                     and issubclass(class_obj, PreTrainedModel)
-                ):
+                    and version.parse(version.parse(transformers.__version__).base_version) >= version.parse("4.20.0")
+                )
+
+                if is_diffusers_model or is_transformers_model:
                     loading_kwargs["device_map"] = device_map
 
                 # check if the module is in a subdirectory